Most products are built to impress in demos. The best ones are built to survive repeated use by people who don't care about your intentions.
There's a version of building where you optimize for the launch moment — the press, the metrics spike, the investor update. And there's another version where you think about the 200th session, not the first.
The hard thing is that the first version often works in the short run. Which is why so few people bother with the second.